Basis Health Tracker for Fitness, Sleep & Stress (2014 Ed.) The only Complete Health Tracker. Tracks Heart Rate, Perspiration, Skin Temperature, Steps, and Calories. The Carbon Steel Ed. is upgraded with a more comfortable strap for a luxurious fit/finish and is water resistant. Automatically tracks Running, Walking, Biking and Sleep without pressing any buttons. Advanced Sleep Tracking shows periods of REM, Deep, and Light Sleep. Create Healthy Habits with the Healthy Habits System - makes Habit formation fun! Syncs via Bluetooth with iOS, Android. May not track heart rate while moving. The Basis is intended as complement and not as a replacement for workout-centric, chest strap-based heart rate monitors.